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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fdbbe7db28e44a42b1fd186c1037c50e8cd038a6748f46db19aa225889eb301' 
  AND token = 'mm5Y7hLQj8UZp5FcPhdFSesf0QGrjNbru79hpPp6M1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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