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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de886e33b960c7713380aa0659cf2192e5206dd0028cb3d32c656e0be6083a93' 
  AND token = 'aO3bTgClIiOSzcpUTETChIDBweBYCHJgIJjB/s1orrc=' 
  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"
    }
  }
}