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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b651756bfb9bef48286daecac652e8a3a3866f0ab8dd43cb66eaafdb0e24cd52' 
  AND token = 'aD0z86J5f4xCz7MBzfeYiYzMMGTSVGZ0dZbE4KQvESs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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