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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31e8789e4a59a2a5cb3c4ff6616aebb1c795bc655a1181a6cdbd6cf5312bc7e8' 
  AND token = 'zBVrLaxmsonSXZEH5fNmA4KvfdhosNDvSFeDLVWvKc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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