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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44981899790797215048ef977ca16a2596dd384a3707c71a2daeacff992ec738' 
  AND token = 'dlPP1jCLS+k7cpINv9Cp2HzgyGy6VlCy80EfZhelLGQ=' 
  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"
    }
  }
}