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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '608af93bea917c4c72fe4583a5db042448ad283ea1661e7c82755ec81c66e280' 
  AND token = 'WzNx9AOHxnj3znlvfaQS+YQS5tyW8ya3IJ1a1NpUiig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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