SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'c15cb3cd00e9d2c59304ec440463376e4d1b0b495428fbf689b77c1083075362' 
  AND token = 'wXq+KIGuw7rg5hp/r0LEFtJdIkj5QqHhKjixEHS/rcg=' 
  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"
    }
  }
}