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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '938b6f9c8de6a22fd5a81f65cb8ce98a65d5634b23d7c53bc9adb3e7911b9fd8' 
  AND token = 'sM1pOjmF5Tat8w0fhrpFIRC1HeHSUXDlvGYi0124IYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00007

JSON explain

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