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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '218478c018dccd956e1c45d94441e13f8bf539e00ef67f509f9f11e26acb3367' 
  AND token = '3ucpOg6pjr5uFOKqwjaXCo7InR/NT4QCuKXt8nK6cwQ=' 
  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"
    }
  }
}