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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa80e7ad795c31660949403e66284c27c732f8871c39d96e559b7ef9d380fa65' 
  AND token = '3k1qhl9LBv9kfPTJRUxeZ+1Mx7fBDchn7A8LwcVLlFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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