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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84bb9dffc9aa428c869db4de700fd5fa87756e5e6fb45f176b5b3634d01ee036' 
  AND token = 'SdFzpMOpowOepg2J25gTUZ7FSy38KnwJWaqN5WRVRvE=' 
  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"
    }
  }
}