SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f95599784cb44445d2fc33a8a8f083ff0a704e439a2ace883c5fe20460ba3054' 
  AND token = 'Bz92v9+GGymjDnW+KHVMwfkKfhO0A/cLC8v98I7/6hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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