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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00c3c45f5255bda494fc292ce356ce00fd524e94e7570747c33d0790c3e43fb3' 
  AND token = 'Put2jWN9ffE9OkSJaFRkKJdCCsDXrJhzL7mF6AI+bBY=' 
  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"
    }
  }
}