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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dcdb70f9df8d75cabd3664039e7dfbc58c66193a20b3662f34ba4ab0cfa31bd' 
  AND token = 'uyoM0F0qPhSxbRSxlt9P4ppH5o7ik6bwnH0prBly+JU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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