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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bf372a30d4c990474e2196dbbc69f18534b60d40319f41832b8fe86689c9356' 
  AND token = 'kqH0+IfiEGuGC2oOfjIN/9r5urbLv+u9uOssIhMJ55g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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