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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7050e7ba9f07a90e574208c808681ee9deba45fc9f1ab596fdff1de0c91f15d' 
  AND token = '2Jqb+LcuVefbVznQh90TudR0UDsNprKLUQ7uhtm4TqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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