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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7feb45713000c0ee24e6020ca55ae1c16866376e4f9f6a062da98956ee7138dd' 
  AND token = 'IiOJv5vZd1oyCaKTZcGmGcLP+014v9fyFr4nroMQLc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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