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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24a5ebae86a0d3a485e09ddb442721da5f67bf56be94431a9b08c0492e15dcdc' 
  AND token = '/BGvGeDT9pmMnr0WSRGI6k/F1TYprQ85hzlqAq+dHu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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