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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a83e404b81138d69fc9d1b0a48596d928b4b57b22b1ae929a212338ab429057' 
  AND token = 'isDqrvWG5QjL6RmcZ/+iIU8eSKWkM8HH+xZEnt+xFRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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