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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0ae7de42e4c7c6bb78bb9a6a354fc2de0a0a0809e53023afe3019f453c35df7' 
  AND token = 'aZA69I6da/Q64Nvj78eLunRBIklR7L8RmQDyM7WE2DQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}