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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0daff93d28c4128d8ad8d56cb3f5be097433d7d44bda00d2a602fd71becf32ef' 
  AND token = 'sqzyHxc6V9VI46I3HmKRv9QycTmBCt5yKvCKxsOemEw=' 
  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"
    }
  }
}