Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8c3a4e236f1f1953a83154913ddc38acb23bb467545f3d214aa30690399fbdd' 
  AND token = 'FKA0eT8zYc/nbCotMKGJP21lYJkr4doZAX51EC/c/Wo=' 
  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"
    }
  }
}