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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04c4eca3e3a4d1abaaae229524dbb48ac519bc4ef698659484b0835f70480d19' 
  AND token = 'WtdZTCjL0HuVV1j9I700kQLKwIBYYqJoWKheSCRP0ns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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