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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e784ce29d85e98849b85cb58931b999124f208be2c6c8ff96dbd2bdbb6dcdacf' 
  AND token = 'KfBx7hFzvdFPghF5Ab2o8iHtq7tf7tCMgQNHg4ekbbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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