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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76f6236dbeea00419df700f98bedcddfe26b5683969f2fe3366552b785506a53' 
  AND token = '7fsrUN7yRD0iuewRW6qgVURM/S98GfqC9S+ohvGVN00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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