Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d1a27c8baaad03ce29171cf639ee9697a8fb6e2be2580555322bc3ea7c0c423' 
  AND token = 'G0Jgh1b6blTZN7dcpZumf0X1SDvmQ5RAal4qEtSf4tE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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