SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'b5993fab31ca953d4138d31dda2999dade63797692395a85e6f93d5fa6f83773' 
  AND token = '6cVFStYHXz5XZyNjZZOfuCeqogYqBprGSGbQlM9fsYc=' 
  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"
    }
  }
}