SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'cf140328515528be8313f800d00b38092c7572362837b7bde593d34bf89ea266' 
  AND token = '8UgcURYgCwUQezLCLYWoXqiICQKJAMbKmQA6Jz+EYHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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