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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '911c9ee949166737b6d9ae09339ccbe42e4e40b24adc07cac0d0242411784fed' 
  AND token = 'ysqu7rLWsBN/4Qrq9UiYMbU09xAu6nTFh3okHTt8Rjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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