Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97ef6d0e0bcbf5a6dd0e8585ad3e4d96a795907c4ffe53e38e546bb7f2d79173' 
  AND token = 'El38n8dHYp9DK0tYu9gh0V8De+Iwev+s+N1KN/WpYTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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