SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '2fa90c1dc6b24f7df63d7fc7eccfac9d1b173fc183380cfb98e9257d446ec162' 
  AND token = '/wzQWC5Mr91j9grTLEOPQHkhtT9YonQVIZAFCackjy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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