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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cac321164c778f6057ba27f41d889c4be1559cf5437ed0d574e8e89696533fcf' 
  AND token = '147gqrBxawgOf2g5klgGp3LqHLFbIFl1RfQvxIPbG0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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