SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fa5785918c576a115f636935adbfc4578078659c162179b68b1f18830899457' 
  AND token = 'LCzCgZ8UvPCzmLVJSfhP5+dripTeNqq7k/fSG2amRoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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