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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '386d4a2abb330c2cd4e612af1fe4962d7e1933fc174372465b44a9b8ac417db4' 
  AND token = 'clwvf0KalIPdmsao5jikqHVT0A8B4J2MRtLltZ7MJRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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