Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1188a7d8961e9e8e94348dcc43533d3e811f24da1870d00898340d3d7a4b2d9c' 
  AND token = 'tWQAM5spDiEPwzwsFbAsAzPedz+5Rx15+b0LsX2vb8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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