SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '59fbb14d2d55839fecdc6d6d77a192bf31ca53cb55f527cf20f8a236cee08acb' 
  AND token = 'X20elyrMqdugnxFGfPFbG6wZh5d+Wx3CwOAQ6LgQsZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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