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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'b36d9225845fc7ff8e5d52da6af78c9d31b16f87bb603693785146388733b247' 
  AND token = 'Ox0ER3nLSXMCS0Abkh4l8Hx53YUX9RtQutH7ngOxQ4U=' 
  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"
    }
  }
}