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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '2040c188124822c4ed20f18c0ee5e7df42607bc89e3214082eeee5e00f6af075' 
  AND token = 'Ua7BKtfrPWQ3YPyZNdX4Sx6N+2C+Vn5FkyBchOGzw1k=' 
  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"
    }
  }
}