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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '057570ece9b4a5786b0682607714c86ba794b3eaf8559780e9e26ef83edab0dc' 
  AND token = 'sxHoscSxlX0f1gGoXnDovXvNSfZBYpn6BZ6d22Kjo7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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