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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '90593ff638e31d49e3aefbc49bc62536d350b96fc0d40a2d969c6088136330ac' 
  AND token = 'BCOtMqdIICqp1Zc8fu26Yd8O7l+T4KpwxHwz0p7Iyxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00768

JSON explain

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