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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f69a8ff6644e62f9bb9492f78d9abd6b4aab2dca34085556dd004fc667bd3681' 
  AND token = 'OuZ7k1Ya8UTtA5y6iQxj5X8gYy4ivPp+YAi3jMCXWyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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