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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ece2b1c3eaa975bc1edd803222681ba93ea54f9b289cc5fb1b08a23f4ef2320' 
  AND token = '31h1nE5Ycht7vyBv6rb8QM0GdKQUCxl/zKtEAmlr5Yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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