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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cfab20275afddd72c4a7b7afacfad2f5718bb054a960f439d66a624720549ae' 
  AND token = '6MKd6XSYpzlkEzTUw4t3qEwCKErMNn45Mt9+D8XxXRY=' 
  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"
    }
  }
}