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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cf8ecce54e81edcc901b72a210722ce6323da2cdb2b4b1cb5c7b9ff8512caee' 
  AND token = 'ih3iJMVyQR4HmexV6WZMJf+rlibX4D4NC84bUZqKekQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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