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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36e34e140ce9fad8a34df2d5851432a49cb8668af4d213e66a0223d6eab29b45' 
  AND token = 'l9ku6VLV8xEU3MqzyDZZzJkJ1YBJVk21gEntgC5fNoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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