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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '030a911d664325a1530c687b08d5fb88b2e72435371bfe4a2a24e8396be8b3ae' 
  AND token = 'A8wHlPFPZnY6D9aNl7dxVJdLe8m13WKq3Y7cqrd85RQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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