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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffe7bcc0213adffbf519a46902c43158176b89052105396d9c4542100ff77050' 
  AND token = '8aGaOAXvkwvCXtr1O6Qx5pA8RhbSuAf7jGl3DiADWqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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