SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '211895bffc723b7ab913fa9e3a0b6e9773c3fbaba04786c15065cfd1590b271e' 
  AND token = 'M6P/KIgjbvThxlkt6T8ierjNmGzlygwUWA3FCnpFtZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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