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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e96be40d5985d9f28273ad042ab5dc789c2de5a9d3146e9cd78398292e462c3' 
  AND token = 'N854kSw/VQ9Pb0puEfSqU3vkPdoC2T3gWxyEpXwDr1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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