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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfee3451b9f2e1d9e09603d1ea3907d346b51e393bc3850dbb43ef00231db145' 
  AND token = 'dbcBpqMQTsZ0VxDW8Tz+/wOm1yJy4DmdV2x31nxa7Rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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