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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73ce3a86c69d6f693c1f9c2efb68a7d30a6a9d4789c0fa3127afa569ba189660' 
  AND token = 'nkYF9HijA3xt3bAiawJZ1H824WMc2EC2LimD1nlMo8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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