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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b41731108b5f861d26a7d0e75fab2f2b9616538056c1a7e1bf0e67b6ae88c8a' 
  AND token = 'D+4Jaz3mkg/si6nWdKSVg/TZNPX9xFgMmgbo+ywfcXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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