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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '391109cc375a75c2c41b90ce2fbec151722e76dc1bf05810258705d2002955db' 
  AND token = 'lpYt8EZeaO0dHP4A23RbAZNUa3Jzist4XIYisxHtku4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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