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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18cbf2128efaf4878876fc143c94c7c0246140458b11ed47c14b2ba8ce7cd562' 
  AND token = 'msiDD8iX3xgZekTZzYNUnrwmPrMXCg2j8O5UcG0D1oQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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