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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41c1f7022db7c97a848c82697f9c788599ff407a93928b957443d93d48c919ef' 
  AND token = 'VG9gpo4UXlzjEuCzDFEB8XIm7gn3iYH8tC303HB2POM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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