Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4488b97bbbcf18ab00b2a650794d1bd0b22a4731c9e185934792a8ba5e2f336b' 
  AND token = 'H0nEthkog0LIxVb10txQkgZJKCPiZbEqu0rVNFMCRdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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