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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70dbb4a5c935be6068f2b5cf7b230a838b9437fbaa7667f9f78c48388e5ce3de' 
  AND token = '56sJGSqSB8DZhuJBQQIokKtd2vYRPKtLIqPaSeDnyac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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