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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d0e4ddf04e4c3efa1eb58d7406b2bf30d6f6663cce3bbb3db1da3959a98599b' 
  AND token = 'mZ/GRQxhTRzB189KFEn0JhChmPO50eu2A0oYn5nYfYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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