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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b881aba4db3d10dda3490e4a6386b7d052a83eab7f0f1379be14c1aa8b914ff0' 
  AND token = 'Bqls/KO3Oub2X+L7w3RxharIW9F58y23RbVQoXKpiz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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