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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42bf20d77cbec0ce768f3b7ab93066292ae770995ca9a5d3b90e7874f67e52c3' 
  AND token = 'Lyq3XrKR/3V9NLzA/dvW3Juw8PxiYLXd0oLoJiKWVkU=' 
  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"
    }
  }
}