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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48c8a9bc98f7625feae93212e4a2b19b7a8b57c26f6aed3456776829bbf95860' 
  AND token = '2zAPQru6ReQ9fl2nq+ysj9zuakIo9CZb4nr1Tqdo0tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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