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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '385f16fb8f75e7bb2d2c1662467274ef6a747457f0dc572cbe9f0176060cdefa' 
  AND token = 'XalWCB/+CkJwo7op24U7Nzudpos5Qyf2L+XTJ6ff+CU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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