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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94b3705450b45c57b0d8553241672b54e8d3a4ffc417f7a54172ff51b3a4a738' 
  AND token = 'ZVU5ZJ9+rbauOoaKmGXac+ZEV9bhFeXvMguAVF4Zzks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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