Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b27c0e93b7d0ac898c79ed52ff044fc7331c50a79601b34c8d873f001b33029e' 
  AND token = 'zXKUOp17g4dWWlSbpRNK4zCFwOfSmEiLsQV3AbwjXEw=' 
  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"
    }
  }
}