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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93acf097e329dae761424ff0604c5d9bfe172168ae02a613988eb9b0cfa6c4b0' 
  AND token = 'Tb/C6V9UZ8glicyIFW1yC7qrwXVraaQ9edVt+tXf0FY=' 
  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"
    }
  }
}