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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '726d6272a86e54ff542db3e9d50b5d644c3c6706333fb06ed76ca47b8dc01103' 
  AND token = 'oVNc4ayuTkPuqiy7P6pn6TQFoY86L3nEyieE+kJMb70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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